Outage report · Major outage
Claude outage on Oct 23, 2026
Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5
What happened
Claude reported a major outage starting Oct 23, 2026, 23:37 UTC, affecting claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork. It was marked resolved at Oct 24, 2026, 00:11 UTC.
- The incident lasted 34m from first report to resolution.
- Claude had reported 14 other partial or major outages in the 90 days before it.
- 7 other vendors we track reported a significant incident within 12 hours of it.
Latest update from Claude
The issue affecting Claude models has been resolved. Impact occurred from 16:28 PT / 23:28 UTC on October 23 to 16:59 PT / 23:59 UTC on October 23.
What our independent monitoring saw
Our independent monitoring of Claude started after this incident, so this report is based on Claude's status page.
Other outages around the same time
Significant incidents other vendors reported within 12 hours of this one.
Claude's overall reliability
Claude has a reliability score of 57.0/100, with 99.25% effective uptime and 39 incidents over the last 90 days.
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